Carpenter s square



J. HATHEN.

'Carpenters Square.

No. 28,859. Patented June 28, 1860.

nan 5 5 4 #710 UNITED STATES PATENT orrron JAMES HATHEN, OFPHILADELPHIA, PENNSYLVANIA.

CARPENTERS SQUARE.

Specification of Letters Patent No. 28,859, dated June 26, 1860.

To all whom it may concern:

Be it known that I, JAMES I-IA'rHnN, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and usefulImprovement in Carpenters Squares; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, making a part of thisspecification, in which- Figure 1, represents a side view of theimproved square. Fig. 2, shows a back view of the stock of the same.Fig. 3, a cross-section taken through the stock, showing the interiorattachment of the blade to the stock.

Similar letters of reference indicate corresponding parts in the threefigures.

The objection to the present carpenters or joiners square, which it isthe object of my invention to remedy, is that the blades are liable tobecome loose in the stocks and thus destroy their accuracy, besides, thesquares themselves soon wear out of true, or become so by carelessmanagement, and with the present plan of attaching the blade to thestock, no provision has been made to set them again.

My invention consists in attaching the blade to the stock by one or moreadjustable screws, applied at either end of the stock, and in connectionwith a clamping plate or plates, and a pivot connection of the blade,

'made to secure the blade fixedly in its proper right angular position,and to adjust the blade in case it should be out of true, as will behereinafter described and represented.

To enable those skilled in the art to fully understand my invention, Iwill proceed to describe its construction and operation.

The squares will be made of the same shape and proportions as those atpresent used, and in the present plan of attaching the blade or tongueto the stock, all will be contained within the stock and out of sightexcept a thumb screw, which will not be in the way in the least, inusing the square.

A, represents the blade or tongue, both edges of which are exactlyparallel to each other, in one end of which, a T-shaped slot is punchedout as shown in Fig. 1.

B, is the wooden stock with the usual metal face-plate a, secured to oneedge, that edge that abuts against the work to be squared. One end ofthis stock B is mortised out, forming a recess C. The usual slit is nowout transversely into the end of the stock for receiving the blade A.The blade is now introduced into the slit in the end of thestock, andplaced in a proper position, when two holes are made through the stockand blade at suitable points and pins 0 0 passed through them, and ifnecessary, riveted on each side. It is a fact well known that theseholes cannot be made, and the pins inserted through them, with any greataccuracy, the

.blade will move more or less out of true, and

it is desirable to apply some simple and cheap means for setting theblade after the pins are inserted through it and the stock. To this endI employ a slotted piece of metal J, having a shoulder on its lower end,on which the lower edge of the tongue or blade A, restsa piece being cutout of the blade to allow it to fit well down on the beveled shoulder ofpiece J, and to keep the piece from slipping out of its place. Thispiece J, terminates at its upper end in a screw g, that projects abovethe head of the stock B, and into the T-slot as shown in Figs. 1 and 3,and receives a milled nut h, which presses on the head or end of thestock B,when screwed up, and draws upon the blade A. It will thus beseen that to set or fix the blade at an exact angle, after the pins havebeen inserted that secures it to the stock, it is only necessary to turnthe nut h, when the blade may be drawn or forced to its proper positionto a nicety, and it may afterwards be kept so.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The use of one or more adjusting clamps J, attached to either end of thesquare stock, and made to serve in conjunction with the pins 0, and c,for securing the blade to the stock, and setting the same in a properposition, substantially as described and represented.

. JAS. HATHEN.

Witnesses:

THEO. SHOEMAKER, CHARLES DIss'roN..

